Log4J-重写方法，实现按照日期大小进行分割文件
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1.Log4J配置
log4j.rootLogger =debug,stdout,FILElog4j.category.org.springframework=ERRORlog4j.category.org.apache=ERRORlog4j.appender.FILE=com.xxx.xxx.util.MyDailyRollingFileAppender#org.apache.log4j.RollingFileAppenderlog4j.appender.FILE.File=./logs/config.loglog4j.appender.FILE.DatePattern='.'yyyy-MM-dd'.log'log4j.appender.FILE.MaxFileSize=100MBlog4j.appender.FILE.MaxBackupIndex=-1log4j.appender.FILE.ImmediateFlush=truelog4j.appender.FILE.Threshold=debuglog4j.appender.FILE.Append=truelog4j.appender.FILE.layout=org.apache.log4j.PatternLayoutlog4j.appender.FILE.layout.conversionPattern=[%p][%d{yyyy-MM-dd HH\:mm\:ss}][%c]%m%nlog4j.logger.org.quartz=INFOlog4j.appender.stdout = org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.Target = System.outlog4j.appender.stdout.layout = org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern = [%p][%d{yyyy-MM-dd HH\:mm\:ss}][%c]%m%n#%l%nlog4j.logger.com.ibatis=debuglog4j.logger.com.ibatis.common.jdbc.SimpleDataSource=debuglog4j.logger.com.ibatis.common.jdbc.ScriptRunner=debuglog4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=debuglog4j.logger.druid.sql.DataSource=debuglog4j.logger.java.sql.Connection=debuglog4j.logger.java.sql.Statement=debuglog4j.logger.java.sql.PreparedStatement=debug,stdout2.重写类MyDailyRollingFileAppender.javapackage com.hytera.eems.util;import java.io.File;import java.io.IOException;import java.io.Writer;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;import java.util.GregorianCalendar;import java.util.Locale;import java.util.TimeZone;import org.apache.log4j.FileAppender;import org.apache.log4j.Layout;import org.apache.log4j.helpers.CountingQuietWriter;import org.apache.log4j.helpers.LogLog;import org.apache.log4j.helpers.OptionConverter;import org.apache.log4j.spi.LoggingEvent; public class MyDailyRollingFileAppender extends FileAppender {// The code assumes that the following constants are in a increasing // sequence. static final int TOP_OF_TROUBLE = -1; static final int TOP_OF_MINUTE = 0; static final int TOP_OF_HOUR = 1; static final int HALF_DAY = 2; static final int TOP_OF_DAY = 3; static final int TOP_OF_WEEK = 4; static final int TOP_OF_MONTH = 5; /** * The default maximum file size is 10MB. */ protected long maxFileSize = 10 * 1024 * 1024; /** * There is one backup file by default. */ protected int maxBackupIndex = 1; /** * The date pattern. By default, the pattern is set to "'.'yyyy-MM-dd" * meaning daily rollover. */ private String datePattern = "'.'yyyy-MM-dd"; /** * The log file will be renamed to the value of the scheduledFilename * variable when the next interval is entered. For example, if the rollover * period is one hour, the log file will be renamed to the value of * "scheduledFilename" at the beginning of the next hour. * * The precise time when a rollover occurs depends on logging activity. */ private String scheduledFilename; /** * The next time we estimate a rollover should occur. */ private long nextCheck = System.currentTimeMillis() - 1; Date now = new Date(); SimpleDateFormat sdf; RollingCalendar rc = new RollingCalendar(); int checkPeriod = TOP_OF_TROUBLE; // The gmtTimeZone is used only in computeCheckPeriod() method. static final TimeZone gmtTimeZone = TimeZone.getTimeZone("GMT"); /** * The default constructor does nothing. */ public MyDailyRollingFileAppender() { } /** * Instantiate a <code>MyDailyRollingFileAppender</code> and open the file * designated by <code>filename</code>. The opened filename will become the * ouput destination for this appender. */ public MyDailyRollingFileAppender(Layout layout, String filename, String datePattern) throws IOException { super(layout, filename, true); this.datePattern = datePattern; activateOptions(); } /** * Get the maximum size that the output file is allowed to reach before * being rolled over to backup files. * * @since 1.1 */ public long getMaximumFileSize() { return maxFileSize; } /** * Set the maximum size that the output file is allowed to reach before * being rolled over to backup files. * * <p> * This method is equivalent to {@link #setMaxFileSize} except that it is * required for differentiating the setter taking a <code>long</code> * argument from the setter taking a <code>String</code> argument by the * JavaBeans {@link java.beans.Introspector Introspector}. * * @see #setMaxFileSize(String) */ public void setMaximumFileSize(long maxFileSize) { this.maxFileSize = maxFileSize; } /** * Set the maximum size that the output file is allowed to reach before * being rolled over to backup files. * * <p> * In configuration files, the <b>MaxFileSize</b> option takes an long * integer in the range 0 - 2^63. You can specify the value with the * suffixes "KB", "MB" or "GB" so that the integer is interpreted being * expressed respectively in kilobytes, megabytes or gigabytes. For example, * the value "10KB" will be interpreted as 10240. */ public void setMaxFileSize(String value) { maxFileSize = OptionConverter.toFileSize(value, maxFileSize + 1); } /** * Returns the value of the <b>MaxBackupIndex</b> option. */ public int getMaxBackupIndex() { return maxBackupIndex; } /** * Set the maximum number of backup files to keep around. * * <p> * The <b>MaxBackupIndex</b> option determines how many backup files are * kept before the oldest is erased. This option takes a positive integer * value. If set to zero, then there will be no backup files and the log * file will be truncated when it reaches <code>MaxFileSize</code>. */ public void setMaxBackupIndex(int maxBackups) { this.maxBackupIndex = maxBackups; } /** * The <b>DatePattern</b> takes a string in the same format as expected by * {@link SimpleDateFormat}. This options determines the rollover schedule. */ public void setDatePattern(String pattern) { datePattern = pattern; } /** Returns the value of the <b>DatePattern</b> option. */ public String getDatePattern() { return datePattern; } public void activateOptions() { super.activateOptions(); if (datePattern != null && fileName != null) { now.setTime(System.currentTimeMillis()); sdf = new SimpleDateFormat(datePattern); int type = computeCheckPeriod(); printPeriodicity(type); rc.setType(type); File file = new File(fileName); scheduledFilename = fileName + sdf.format(new Date(file.lastModified())); } else { LogLog.error("Either File or DatePattern options are not set for appender [" + name + "]."); } } void printPeriodicity(int type) { switch (type) { case TOP_OF_MINUTE: LogLog.debug("Appender [" + name + "] to be rolled every minute."); break; case TOP_OF_HOUR: LogLog.debug("Appender [" + name + "] to be rolled on top of every hour."); break; case HALF_DAY: LogLog.debug("Appender [" + name + "] to be rolled at midday and midnight."); break; case TOP_OF_DAY: LogLog.debug("Appender [" + name + "] to be rolled at midnight."); break; case TOP_OF_WEEK: LogLog.debug("Appender [" + name + "] to be rolled at start of week."); break; case TOP_OF_MONTH: LogLog.debug("Appender [" + name + "] to be rolled at start of every month."); break; default: LogLog.warn("Unknown periodicity for appender [" + name + "]."); } } // This method computes the roll over period by looping over the // periods, starting with the shortest, and stopping when the r0 is // different from from r1, where r0 is the epoch formatted according // the datePattern (supplied by the user) and r1 is the // epoch+nextMillis(i) formatted according to datePattern. All date // formatting is done in GMT and not local format because the test // logic is based on comparisons relative to 1970-01-01 00:00:00 // GMT (the epoch). int computeCheckPeriod() { RollingCalendar rollingCalendar = new RollingCalendar(gmtTimeZone, Locale.ENGLISH); // set sate to 1970-01-01 00:00:00 GMT Date epoch = new Date(0); if (datePattern != null) { for (int i = TOP_OF_MINUTE; i <= TOP_OF_MONTH; i++) { SimpleDateFormat simpleDateFormat = new SimpleDateFormat( datePattern); simpleDateFormat.setTimeZone(gmtTimeZone); // do all date // formatting in GMT String r0 = simpleDateFormat.format(epoch); rollingCalendar.setType(i); Date next = new Date(rollingCalendar.getNextCheckMillis(epoch)); String r1 = simpleDateFormat.format(next); // System.out.println("Type = "+i+", r0 = "+r0+", r1 = "+r1); if (r0 != null && r1 != null && !r0.equals(r1)) { return i; } } } return TOP_OF_TROUBLE; // Deliberately head for trouble... } /** * Implements the usual roll over behaviour. * * <p> * If <code>MaxBackupIndex</code> is positive, then files { * <code>File.1</code>, ..., <code>File.MaxBackupIndex -1</code> are renamed * to {<code>File.2</code>, ..., <code>File.MaxBackupIndex</code> . * Moreover, <code>File</code> is renamed <code>File.1</code> and closed. A * new <code>File</code> is created to receive further log output. * * <p> * If <code>MaxBackupIndex</code> is equal to zero, then the * <code>File</code> is truncated with no backup files created. */ public// synchronization not necessary since doAppend is alreasy synched void sizeRollOver() { File target; File file; LogLog.debug("rolling over count=" + ((CountingQuietWriter) qw).getCount()); LogLog.debug("maxBackupIndex=" + maxBackupIndex); String datedFilename = fileName + sdf.format(now); if (maxBackupIndex > 0) { // Delete the oldest file, to keep Windows happy. file = new File(datedFilename + '.' + maxBackupIndex); if (file.exists()) file.delete(); // Map {(maxBackupIndex - 1), ..., 2, 1} to {maxBackupIndex, ..., 3, // 2} for (int i = maxBackupIndex - 1; i >= 1; i--) { file = new File(datedFilename + "." + i); if (file.exists()) { target = new File(datedFilename + '.' + (i + 1)); LogLog.debug("Renaming file " + file + " to " + target); file.renameTo(target); } } // Rename fileName to datedFilename.1 target = new File(datedFilename + "." + 1); this.closeFile(); // keep windows happy. file = new File(fileName); LogLog.debug("Renaming file " + file + " to " + target); file.renameTo(target); }else if (maxBackupIndex < 0){//infinite number of files //find the max backup index for (int i = 1; i < Integer.MAX_VALUE; i++) { target = new File(datedFilename + "." + i); if (! target.exists()) {//Rename fileName to datedFilename.i this.closeFile(); file = new File(fileName); file.renameTo(target); LogLog.debug("Renaming file " + file + " to " + target); break; } } } try { // This will also close the file. This is OK since multiple // close operations are safe. this.setFile(fileName, false, bufferedIO, bufferSize); } catch (IOException e) { LogLog.error("setFile(" + fileName + ", false) call failed.", e); } scheduledFilename = datedFilename; } public synchronized void setFile(String fileName, boolean append, boolean bufferedIO, int bufferSize) throws IOException { super.setFile(fileName, append, this.bufferedIO, this.bufferSize); if (append) { File f = new File(fileName); ((CountingQuietWriter) qw).setCount(f.length()); } } protected void setQWForFiles(Writer writer) { this.qw = new CountingQuietWriter(writer, errorHandler); } /** * Rollover the current file to a new file. */ void timeRollOver() throws IOException { /* Compute filename, but only if datePattern is specified */ if (datePattern == null) { errorHandler.error("Missing DatePattern option in rollOver()."); return; } String datedFilename = fileName + sdf.format(now); // It is too early to roll over because we are still within the // bounds of the current interval. Rollover will occur once the // next interval is reached. if (scheduledFilename.equals(datedFilename)) { return; } // close current file, and rename it to datedFilename this.closeFile(); File target = new File(scheduledFilename); if (target.exists()) { target.delete(); } File file = new File(fileName); boolean result = file.renameTo(target); if (result) { LogLog.debug(fileName + " -> " + scheduledFilename); } else { LogLog.error("Failed to rename [" + fileName + "] to [" + scheduledFilename + "]."); } try { // This will also close the file. This is OK since multiple // close operations are safe. super.setFile(fileName, false, this.bufferedIO, this.bufferSize); } catch (IOException e) { errorHandler.error("setFile(" + fileName + ", false) call failed."); } scheduledFilename = datedFilename; } /** * This method differentiates MyDailyRollingFileAppender from its super class. * * <p> * Before actually logging, this method will check whether it is time to do * a rollover. If it is, it will schedule the next rollover time and then * rollover. * */ protected void subAppend(LoggingEvent event) { long n = System.currentTimeMillis(); if (n >= nextCheck) { now.setTime(n); nextCheck = rc.getNextCheckMillis(now); try { timeRollOver(); } catch (IOException ioe) { LogLog.error("rollOver() failed.", ioe); } } else if ((fileName != null) && ((CountingQuietWriter) qw).getCount() >= maxFileSize) { sizeRollOver(); } super.subAppend(event); } } /** * RollingCalendar is a helper class to MyDailyRollingFileAppender. Given a * periodicity type and the current time, it computes the start of the next * interval. * */ class RollingCalendar extends GregorianCalendar { private static final long serialVersionUID = -3221682547248233865L;int type = MyDailyRollingFileAppender.TOP_OF_TROUBLE; RollingCalendar() { super(); } RollingCalendar(TimeZone tz, Locale locale) { super(tz, locale); } void setType(int type) { this.type = type; } public long getNextCheckMillis(Date now) { return getNextCheckDate(now).getTime(); } public Date getNextCheckDate(Date now) { this.setTime(now); switch (type) { case MyDailyRollingFileAppender.TOP_OF_MINUTE: this.set(Calendar.SECOND, 0); this.set(Calendar.MILLISECOND, 0); this.add(Calendar.MINUTE, 1); break; case MyDailyRollingFileAppender.TOP_OF_HOUR: this.set(Calendar.MINUTE, 0); this.set(Calendar.SECOND, 0); this.set(Calendar.MILLISECOND, 0); this.add(Calendar.HOUR_OF_DAY, 1); break; case MyDailyRollingFileAppender.HALF_DAY: this.set(Calendar.MINUTE, 0); this.set(Calendar.SECOND, 0); this.set(Calendar.MILLISECOND, 0); int hour = get(Calendar.HOUR_OF_DAY); if (hour < 12) { this.set(Calendar.HOUR_OF_DAY, 12); } else { this.set(Calendar.HOUR_OF_DAY, 0); this.add(Calendar.DAY_OF_MONTH, 1); } break; case MyDailyRollingFileAppender.TOP_OF_DAY: this.set(Calendar.HOUR_OF_DAY, 0); this.set(Calendar.MINUTE, 0); this.set(Calendar.SECOND, 0); this.set(Calendar.MILLISECOND, 0); this.add(Calendar.DATE, 1); break; case MyDailyRollingFileAppender.TOP_OF_WEEK: this.set(Calendar.DAY_OF_WEEK, getFirstDayOfWeek()); this.set(Calendar.HOUR_OF_DAY, 0); this.set(Calendar.SECOND, 0); this.set(Calendar.MILLISECOND, 0); this.add(Calendar.WEEK_OF_YEAR, 1); break; case MyDailyRollingFileAppender.TOP_OF_MONTH: this.set(Calendar.DATE, 1); this.set(Calendar.HOUR_OF_DAY, 0); this.set(Calendar.SECOND, 0); this.set(Calendar.MILLISECOND, 0); this.add(Calendar.MONTH, 1); break; default: throw new IllegalStateException("Unknown periodicity type."); } return getTime(); } } 0 0
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